MFJ-266 HF/VHF/UHF Antenna Analyzer
Instruction Manual
©
2011 MFJ Enterprises, Inc.
3
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2.1 mm
Inserting the plug into the power jack automatically disables the internal AA battery pack and
switches the analyzer over to the external voltage source.
Important Warnings: Reverse polarity or excessive voltage could permanently damage the
MFJ-266! To avoid damage:
1. Never apply more than 13 Volts
2. Never connect an AC transformer or positive-ground power source
3. Never install or remove batteries with external power connected
4. Never change batteries with the PWR switch on
3.0 Operating Mode
Once you have suitable power (battery or external), you're ready to explore the analyzer's basic
operating features. Begin by pressing the red
PWR
button on.
BAND-MODE
SELECT
Up Down
ANT Counter
Bk Lite
PWR
ON
OFF
3.1 Display Backlight
When the analyzer comes on, the screen displays a brief 1-second prompt before automatically
switching to the main menu. This prompt allows you to turn on the optional display backlight. If
you elect to use it, press the
Up
button
immediately,
before the screen changes to the main menu
and hold it down until the backlight comes on. If you ignore the prompt, the backlight will
remain off. Off is the default setting to reduce battery drain.
3.2 Main Menu Screen
The main menu screen has two purposes:
(1.)
Power Supply Voltage:
Appears on the right side of the screen. If it falls outside the
10.8 to 12.5-V operating window, be sure to change batteries or make power supply
adjustments.
